Grizzly for ore separation



vv. Ross.l GRIZZLY FOR ORE SEPARATION.

APPLICATION FILED IUNE 7, i919.

Patented Mar. 2, 1920.

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IIIIIII-'lumlw W. ROSS. GRIZZLY FOR ORE SEPARATION.

APPLICATION FILED JUNE 7. I9I9. 1,332,305.

Patented Mar. 2, 1920.

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WILLIAM ROSS, MONTREAL, QUEBEC, CAADA.

GRIZZLY FCR ORE SEPARATQON.

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Specification of Letters Patent.

" Patented Mar. 2, 192e.

Application led June 7, 1919. Serial No. 302,373.

To all whom t may concern:

Be it known that I, WILLIAM Ross, a subject of the King of GreatBritain, and resident of the city of Montreal, in the Province ofQuebec, Canada, have invented certain new anduseful improvements inGrizzlies for Ore Separation. of which the following is a specification.

This invention vrelates to what are commonly known as grizzlies, thatis. coarse screens formed of horizontal bars connected together andtraveling in a closed orbit. In using such screens much trouble iscaused by pieces becoming wedged between the bars, and by tine materialwhich falls through the upper bars falling on the lower bars andcollectiner there. Apparatus to overcome this diifdulty is described andshown in my co-pending application No. 270589 tiled January 10th, 1919,and the object ofthe present invention is to devise apparatus which willpossess the advantages of that set forth in the application referred to,which will operate at greater speed, and which may be readily arrangedto classify the material into more than two products.

l attain my object by means 'of the constructions hereinafter describedand illustrated in the accompanying drawings in which- Figure 1 is aside elevation, partly broken away and partly in section, of a grizzly7constructed in accordance with the presentinvention; v

Fig. 2 a plan view of the same;

Fig. 3 a side elevation of asimple form of the invention;

Fig. more particularly the nmeans for vertically adjusting thesupporting tracks ot one of the sets ot' grizzly bars; I

Fig. 5 a side elevation of part of a grizzly showing a modification ofthe form of the grizzly bars; and n Fig. 6 a side elevation illustratingmore or less diagranunatically an arrangement of grizzly bars forclassifying material into more than two products. y ln the drawings likedifferent figures.

Referring particularly to Fig. 3, 1 are the main. grizzly bars suitablycarried by disks 2. These disks are also adapted to support a chain 3,to the links of which are secured t L1 a partial cross section show vingnumerals of reference indicate corresponding parts in the theintermediate grizzly bars el. In the drawings, the disks are to receivethe bars 4, so that the spacing of the main and intermediate bars isalways accurately maintained.

rlhe chain 3 is of a length greater than the circumference of the circleintersecting the axes of the main grizzly bars. Consequently, at theunder side the intermediate grizzly bars fall away from and hang belowthe main bars, so that the horizontal spacing between the bars at theunder side of the grizzly is twice that at the upper side, thusfacilitating the discharge of the tine materials passing through theupper part of the grizzly.

The preferred arrangement is shown in Figs. 1 and Q. lin this form boththe main and intermediate grizzly bars are carried by chains, and thechains are supported on two sets of sprocket wheels to cause the bars tomove in an elong( ted orbit with its major axis substantiallyhorizontal.

5-.-5 are shafts, each carrying two pairs of sprocket wheels 6 and 7 Onthe sprock` .preferably given an undulated or serrated as to cause avertical vibraupper surface so which is particularly useful tion of thebars,

shown as notched in the screening of wet or sticky material,

which is liable to clog the apparatus. Preferably the tracks which areso undulated are arranged so that they may be brought into or out ofaction. When such tracks are out of action, the supporting of all thebars at the upper part of the apparat the chains of the bars which areso supported, but these are always amply strong to takethe added load.

lnthe drawings, l show the outer tracks 10 as' vertically adjustable,being' secured to sleeves 12 sliding on vertical rods13 secured to theframe and threaded for engagement by the adjusting nuts l-l. By

us falls on l tive position.

, the bars When it 4is desired to classify into more than two sizes, Iadopt the designshown in Fig. 6 in which is shown a third set of grizzlybars l5 carried by sprocket wheels 16 suitably journaled and positionedso that adjacent the receiving end of the grizzly. As the orbit of thebars l5 is considerably shorter than the orbit of the other bars, closespacing is obtained adjacent the feed end of thegrizzly and a widerspacing adjacent the discharge end, while ample increase of spacingbetween the bars at the under sides of their orbits is obtained.

Two separate discharge hoppers 17 and 18 are in this case required. Inthe other forms a single discharge spout 19 is provided. `In all forms afeed spout 20 is employed and a tailing spout 2l.

Preferably, the grizzly bars are round as indicated in most of theiigures of the drawings, but :danged constructions such as shown in Fig.5 may under some circumstances be employed. It will also be understoodthat more than three grades of product may be obtained by furtherextending the principle of construction illustrated in Fig. 6.

What I claim as my invention is 1. In a grizzly, the combination ofsubstantially horizontal main grizzly bars adapted to be moved in aclosed substantially vertical orbit and intermediate grizzly barsconnected independently of the .main bars and also adapted to be movedina closed substantially vertical orbit larger than the orbit of themain bars, said orbits being substantially co-incident for part at leastof their upper sides. i

2. A grizzly constructed substantially as set forth in claim l inv whichthe intermediate bars are carried b v a'pair of suitably supportedchains.

3. A grizzly constructed substantially as set forth in claim v1 in whichthe main and the intermediate bars are carried by two pairs of separatesuitably supported chains.

el. A grizzly constructed substantially as set forth in claim 1providedv with two spaced axles, two pairs of sprocket wheels on eachaxle, two pairs of separate chains supported von the sprocket wheels andto which the main and intermediate grizzly bars are respectivelyconnected, and sup- 15 alternate with the bars 1 and 4` porting meansfor the ends. of the bars' when the latter are in the lupper parts oftheir orbits.

5. A grizzly constructed substantially as set forth in claim l providedwith two spaced axles, two pairs of sprocket wheels on each axle, twopairs of separate chains supported on the sprocket wheels and 'to whichthe main and intermediate grizzly bars are respectively connected, andsupporting means for the ends of the bars when the latter are in theupper parts of their orbits undulated to cause a vertical vibration ofone or both sets of bars.

6. A grizzly constructed substantially as set forth in claim l in whichthe orbits of the main and intermediate grizzly bars coincide forsubstantially the full length of their upper sides and whichv isprovidedwith a third set of grizzly bars movable in a smaller orbit than eitherthe main vor intermediate hars and co-inciding with said o iiits for aportion only of their upper s1 es.

set forth 1n claim 1 provided with two spaced axles, two pairs ofsprocket wheels on each axle, two pairs of separate chainsl supported onthe sprocketvwheels and to 7. A grizzly constructed substantially as atLwhich the main and intermediate grizzly f hars are respectivelyconnected, independent supporting means for the ends of the two sets ofbars when the latter are in the upper parts of their orbits, thesupporting means for one set of bars being undulated to cause a verticalVibration of one set of bars;-

8. A grizzly constructed substantially as set forth in claim 1 providedwith two spaced axles, two 'pairs of sprocket wheels on each axle, twopairs ofseparate chains supported on the sprocket wheels and to whichthe main and intermediate grizzly bars are respectively connected,independent supporting .means for the ends of the two sets of bars whenthe latter are in the upper parts of their orbits, the supporting meansfor one set of bars being Yundulated to cause a vertical vibration ofone set of bars, and means for raising and lowering the last mentionedsupporting means yto bring them into or out of action.

Signed at Montreal this 26th day of April 1919.

t WILLIAM ROSS. Witnesses:

A. ARMSTRONG, G. B. ANDREWS.

